PLAIN water. No nutes!!!!!! No rooting hormones needed either.
I have been completely flummoxed by the fact that I can take a cutting, put it in plain filtered tap water (6.5 out of our whole house filter) and watch it stay green for weeks. (no roots though, I haven't exchanged the h2o either until it gets a bit cloudy)/
I have repeatedly done this with about 30 cuttings I have taken which went tits up in rockwool, an Octo-cloner, rooting plugs, sterile sand, perlite, vermicuite, and potting seed fake soil. Put 'em back in water and they bounce back for the most part.
I haven't yet had any roots show even after two weeks though.
I am attempting to clone a Pure Sativa seeded, 2 month vegging set of a dozen plants rooted from 20 yr old seeds.Being that old I honestly didn't think any of them would sprout since they have been frozen, defrosted, refrigerated, refrozen. left at room temperature for years, and otherwise received nothing but grief from me.
But of those that have rooted, nearly 60% is my guess, the moms (and pops) are vigorous, tall, strong, green, from the get go, very little done to the organic soil they are growing in. No parasites, mites, or other nasties.
But I am totally baffled that I cannot get even one cutting to root. (I am keeping my fingers crossed because an hour ago I checked the ph in the Octo-cloner, took out 7 of the 8 cuttings (they all wilted and just looked awful, but one has sprouted 1/4 inch roots and it's my first in over a month of trying so I don't want to jinx it). I'm ALMOST tempted to take it from the Octo-cloner and put it in plain tap water for the duration of its rooting out b 4 planting in Naturegrow soil and the 18/6 fluoro lights.
I am going to try again with the plain tap water, exchanging it every few days as you suggest and see if that works. What a great no maintenance way to go if it does.